Anthraquinone-di-acridones.



FRITZ ULLMANN, or BERLIN, GERMANY, ASSIGNOR TO ACTIEN GESELLSCHAFT rt'm,

ANILIN FABRIKATION, or BERLIN, GERMANY.

ANTHRAQUINONE-DI-ACRIDONES.

No Drawing.

the formula:

I may obtain these new products by eliminatingi water from 1.5-dianilido-anthra u1- noneicarboxylic acids of the general orin which formula R represents an anthraquinone residue or a substituted anthraquinone residue. Thus for instance I use as parent-material for my process the 1.5-dianilido-anthraquinone-dicarboxylic acid:

l/ oo \I m coon NH I which may be obtained by acting with 1.5- dichloroanthraquinone upon anthranilic acid.

The elimination of water from the parentmaterials may be effected by the action of a suitable dehydrating. agent, for instance by warming the acids with concentrated sulfuric acid, or by transforming the res ective carboxylic acid into the correspon ing acid chlorid and treating these chlorlds with aluminiumrchlorid.

Specification of Letters Patent.

Application filed February 23, 1910. Serial No. 545,329.

Patented June '7, 1910.

I The following example serves to illustrate my invention, the parts being by weight: 128 parts of 1.5-dianilido-anthraquinonedicar oxylic acid, 200 parts of phosphorous pentachlorid are heated on the Water-bath until the evolution of hydrochloric acid ceases. The mass is then diluted with benzene and 100-200 parts of anhydrous aluminium-chlorid are added, whereupon hydrochloric acid again evolves, the mass assuming a green color. The react-ion bein performed, the mass is decomposed by ad ing ice and hydrochloric acid and the benzene distilled away by steam, the product of reaction remaining thus as a dark blue powder which is isolated by filtering, washing with water-and drying. The dyestufi thus obtained forms a dark blue powder which dissolves in concentrated sulfuric acid to a red yellow solution. It is insoluble in alcohol and ether,'but soluble in anilin on heating to a violet colored solution. This coloring matter produces on cotton from a vat, prepared by means of a salt of hydrosulfurous'acid and an alkali very fast blueviolet tints. V

.It is obvious to those skilled in the art that my present invention is not limited to the foregoing example or to the details given therein. For instance inusing the carboxylic acids directly for splitting ofif water instead of concentrated sulfuric acid named above any dehydrating agent suitable for my process may be employed.

Having now described my invention and the manner in which it may be carried out, what I claim is,

As a new article of manufacture the hereinbefore'described new dyestufi' of the anthraquinone-series being anthraquinone-di- 2.1-acridone, having the formula:

solution and which new coloring matter is In testimony whereof I have hereunto set insoluble in alcohol and ether but soluble in my hand in presence of two subscribing witanilin on heating to a violet colored solunesses.

tion, and which. new dyestufi forms with a FRITZ ULLMANN. salt of hydrosulfurous acid and an alkali Witnesses: a blue vat, from which cotton is dyed a very HENRY HASPER,

fast blue-violet tint. WOLDEMAR HAUIPT. 

